Jarring machine



March 17, 1931. F. R. WALLACE 1,797,182

JARRING MACHTNE Filed Dec. 12, 1929 giaw.

Patented Mar. 17, 1931 FRANK n. WALLACE, or PHILADELPHIA, PENNSYLVANIA, 'Assmomome ram MANUFACTURING COMPANY, OF PHILAD OF PENNSYLVANIA E PHIA; PENNSYLVANIA, A conronn'rron JARRINGMACHINEL Application filed December 12,1529, se ial 115,413,435}

which is actuated by a jarring piston connected thereto; The arring table is adapted to carry flasks inwhich the molds are formed.

These flasks are often placed so that the load" on the jarring table is not central. One edge of the jarring table, therefore, tends to strike the base before the other edge. This puts a side blow on the piston which in time causes it to tear out the bolts which connect the piston and the table or to break off the piston or sometimesthe cylinder in which it moves or sometimes even the jarring table itself. My invention consists in providing a connection between the jarring table and the piston which permits of sufficient flexibility t eliminate such breakage.

For a further description of my invention reference may be had to the annexed drawings and specification at the end whereof my invention will be-specifically pointed out and claimed.

Inthe drawings,

Figure 1 representsa vertical cross sectlon through my device, and

Figure 2 is a vertical cross section drawn to an enlarged scale and showing in detail the bolts and connecting elements.

Referring to the drawings,

There is shown a jar ramming moldlng l machine consisting of a foundation 1 on which rests a base 2. Cooperating with the base is a jarring table 3 having attached thereto a piston 4. Attached to base 2 is a cylinder 5 within which the jarring piston rides. The piston 4 is fluid operated by pressure introduced through pipe 6 and valve mechanism 7. This causes piston 4 to carry table 3 and the flasks carried thereby upward and then permits them to drop so that table 3 strikes base 2 at the marginal portions .or ribs thereof with a sharp blow.

Referring now more especially to Figure 2, there is shown a construction in which table 3 is connected to piston 4. Piston 4 is 3 formed with a flange 8 having a series of holes therein. Table 3 has a flange 9 having tapped'holes therein and adapted to come opposite the'holes in flange 8. Bolts 10 pass .through the holes in into thetapp ed holes inflange 9 andthereby' fasten table 3 to. piston The bo'lts have their ends riveted "over against table 3 as indicated at 11. A flexible connection'or coupling between table 3 and piston 4 is providedby inserting disksv 12 and}13,'which,may also be of any other'suitable shape, between flange 8 and flange 9 and between flange '8 and plate 14 which is carried beneath the heads of bolts"- 10. The disks 12 and 13 may be'of rubber ing action and thereby permit the flange 9 to move relative to flange 8, an amount equal to the compression of the washers 12 and 13. An

attempt has been made to illustrate upon the drawing anyslight clearance that is neces sary to permit of the described relative movement in the nature of universal movement but the clearance is exaggerated and thewabbly movement though exceedingly small is suffie cient to relieve excessive strain of table 3 on piston 4 and to thereby eliminate much break l age of piston 4 or pulling of bolts 10.

and 13 are slightly compressed by this clamp In further explanation it may be said that l i if the load on the table 3 is mbalanced, for

example, heavier on the lefthand side of the table, the lefthand striking surfacewill strike slightly inadvance, in point of time, than the righthand striking surface. There will,

therefore, be a slight turning movementof the table into horizontal position, but since the connection between the piston andtable is flexible, the piston is free to adjust itself through slight vertical movement and there is no side blow on the piston. 1

fications may be made in details of construction and arrangement and matterso'f mere It will be obvious to those skilled the to which the invention relates that modiform without departing from thespirit of;

the invention which is not limited to such mat:

ters or otherwise than the prior art and the appended claims may require.

I claim: 7 V v 1. A jarring machine comprising a piston,

' a jarring table, bolts connecting said piston v and said table, and compression members interposed between said piston and said table.

2. In a jar ramming molding machine the combination of a base and a table having prom vid'ed between them a marginally arranged horizontal striking surface, a cylinder provided on the base and disposed substantially centrally of the table, a piston arranged for: 1 i vertical reciprocation in the cylinder, over- 5 lapping flanges provided on the table and piston, and ayielding medium interposed between said flanges and providing a flexible coupling adapted to permit the piston to continue to move vertically when one side of the 20 table under unbalanced load strikes a blow in advance on a portion of the striking surface whereby breakage is prevented.

e V I FRANK, R; WALLACE, 

